EP3159660B1 - Procédé et capteur de rotation destiné à mesurer une position angulaire d'un capteur rotatif - Google Patents

Procédé et capteur de rotation destiné à mesurer une position angulaire d'un capteur rotatif Download PDF

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Publication number
EP3159660B1
EP3159660B1 EP16190120.2A EP16190120A EP3159660B1 EP 3159660 B1 EP3159660 B1 EP 3159660B1 EP 16190120 A EP16190120 A EP 16190120A EP 3159660 B1 EP3159660 B1 EP 3159660B1
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EP
European Patent Office
Prior art keywords
sensor
electrode
capacitance
plane
transmitter
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EP16190120.2A
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German (de)
English (en)
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EP3159660A1 (fr
Inventor
Jens Kurte
Frank Evertzberg
Johann Banmann
Oliver Büse
Florian Schacht
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Miele und Cie KG
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Miele und Cie KG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2412—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2412—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap
    • G01D5/2415—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying overlap adapted for encoders

Definitions

  • the invention relates to a method and a rotation angle sensor for measuring an angular position of a rotary encoder unit for a domestic appliance and a sensor unit, a transmitter unit and an evaluation unit for a rotation angle sensor and finally a household appliance with a rotation angle sensor.
  • a passage opening through a control panel is necessary in order to transmit the rotational angle position of the rotary selector switch by means of a shaft to the evaluation electronics located behind the control panel. So far, the evaluation of the rotational angle position on the operating and display electronics behind the device panel. Depending on the device, incremental or absolute evaluation procedures can be used. Common technologies include optical evaluation by means of coding discs, encoders, bit generators, potentiometers and mechanical switching contacts. All technologies require a passage opening on the device panel for mechanical transmission of the angle of rotation.
  • the EP 0 844 325 A2 describes an actuation and display device.
  • the US Pat. No. 7,023,684 B1 discloses a capacitive encoder with rotor and stator.
  • the object of the invention is to provide an improved method for measuring an angular position of a rotatable transmitter unit, an improved rotation angle sensor for measuring an angular position of a rotatable transmitter unit and an improved sensor unit, an improved transmitter unit and an improved evaluation unit for a rotation angle sensor and an improved domestic appliance.
  • this object is achieved by a method for measuring an angular position of a rotatable transmitter unit, a rotation angle sensor for measuring an angular position of a rotatable transmitter unit, a sensor unit, a transmitter unit and an evaluation unit for a rotation angle sensor and a domestic appliance having the features of the main claims.
  • the electrodes of the transmitter unit and the sensor unit can be made flat. Between the reference capacitance values and the capacitance values, one per capacitance change per sensor electrode is determined in the step of determining. An of the The change in the capacitance is greater for the electrode electrodes influenced by the rotation electrode than at the sensor electrodes, which are uninfluenced by the rotary electrode. If the rotary electrode partially covers the first sensor electrode and the second sensor electrode respectively, the angle value can be determined from a ratio of the capacitance changes.
  • the steps of the method can be repeated cyclically. As a result, variable environmental influences can be filtered out, since the capacitance values are each directly related to the previously determined reference capacitance values. Further, a rotation angle sensor for measuring an angular position of a rotary encoder unit according to claim 3 is presented.
  • a household appliance with a rotation angle sensor is presented according to the approach presented here, wherein the sensor plane of the sensor device is disposed on an inner side of a control panel of the Haushals réelles and the encoder plane is disposed on an outer side of the control panel, wherein the encoder device is rotatably coupled to an operating element of the household appliance and is rotatably mounted on the outside, wherein a rotation axis of the operating element with the centers of the center electrode and the ground electrode substantially coincides and the evaluation device is connected to the sensor electrodes and the ground electrode.
  • the sensor electrodes, the ground electrode, the center electrode and the rotary electrode may be formed as electrically conductive surfaces.
  • the sensor electrodes and the ground electrode can be designed as a foil.
  • the sensor electrodes may be shaped in the shape of a circular ring segment. Due to the circular ring segment shape, the sensor electrodes can completely cover a surface of a circular ring. As a result, the angle value for each angular position can be determined reliably.
  • the ground electrode may be circular in shape. The ground electrode can fill the inner circle of the annulus of the sensor electrodes.
  • the sensor unit may have at least one further sensor electrode arranged in the sensor plane. With three sensor electrodes, the angle value can be determined over a full circle. Angular position can be infinitely determined.
  • a computer program product or computer program with program code which can be stored on a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory.
  • a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory.
  • the program product or program may be used to perform, implement, and / or control the steps of the method of any of the embodiments described above.
  • the approach described can be used in connection with household appliances from different product groups in which hitherto a program selection or menu management by an electro-mechanical rotary selector switch (DWS) takes place.
  • DWS electro-mechanical rotary selector switch
  • the transmission of the rotary motion from the rotary selector switch into the housing by a mounted shaft on a detent and electronic components for the rotation angle evaluation on the control and display electronics (BAE) can now be omitted.
  • BAE control and display electronics
  • a passage opening or bore on the device panel can be omitted.
  • manufacturing costs can be reduced especially for glass panels of kitchen appliances.
  • tie lines omitted in sprayed plastic panels and it is the penetration of liquids and dirt prevented, which makes further design measures for draining the liquids unnecessary, which in turn can be saved costs.
  • FIG. 1 shows a representation of a household appliance 100 with a control element 102.
  • the household appliance 100 is here a washing machine 100 or a tumble dryer 100.
  • the household appliance 100 may for example be a kitchen appliance, such as a stove or oven.
  • the household appliance 100 has a control panel 104.
  • the control panel 104 is part of a front of the household appliance 100.
  • the control element 102 is arranged on the control panel 104.
  • a display 106 is further embedded.
  • the operating element 102 is a rotary selector switch 102 for selecting an operating mode of the domestic appliance 100.
  • the rotary selector switch 102 is arranged on an outer side of the control panel 104.
  • an angular position of the rotary selector switch 102 is read out by a rotation angle sensor according to the approach presented here.
  • the rotary selector switch 102 is non-rotatably coupled to a transmitter unit of the rotation angle sensor.
  • the control panel 104 has no through hole in the region of the rotary selector switch 102.
  • On an inner side of the control panel 104 a sensor unit of the rotation angle sensor is arranged.
  • the sensor unit is arranged opposite the transmitter unit.
  • the sensor unit is connected to an evaluation unit of the rotation angle sensor.
  • the evaluation element is part of a control electronics 108 of the household appliance 100.
  • the control electronics 108 is arranged in the region of the control panel 104 within the household appliance 100.
  • the approach presented here enables the contactless determination of a rotational angle position by means of a device diaphragm 104 by means of capacitive sensor surfaces.
  • a detent mechanism in the rotary selector switch 102 can be dispensed with a passage opening in the aperture 104.
  • no penetration of liquids or dirt into the device 100 is possible.
  • manufacturing costs can be reduced.
  • the capacitive evaluation method presented here is characterized by very cost-effective system components.
  • FIG. 2 shows a block diagram of a rotation angle sensor 200 according to an embodiment.
  • the rotation angle sensor 200 corresponds substantially to that in the household appliance in FIG. 1 installed angle of rotation sensor.
  • the rotation angle sensor 200 consists of three parts, a rotatable transmitter unit 202, a sensor unit 204 and an evaluation unit 206.
  • the transmitter unit 202 is aligned so that its axis of rotation substantially coincides with a center of the sensor unit 204.
  • the transmitter unit 202 and the sensor unit 204 are designed flat. In this case, the transmitter unit 202 and the sensor unit on circular similar active surfaces. The active surfaces are aligned substantially parallel to one another.
  • the transmitter unit 202 has a center electrode 208 and a rotary electrode 210.
  • the center electrode 208 and the rotary electrode 210 are here subregions of a contiguous electrically conductive surface.
  • the center electrode 208 is arranged around and in the middle of the active surface.
  • the rotary electrode 210 is arranged semicircular around the center electrode 208.
  • the sensor unit 204 has three sensor electrodes 212a, 212b, 212c and a ground electrode 218.
  • the sensor electrodes 212a, 212b, 212c are formed as equal sectors of a circular ring.
  • a sensor electrode 212 extends over 120 °.
  • the ground electrode 218 is circular and located in the center of the annulus.
  • the ground electrode 218 is approximately the same size as the center electrode 208.
  • the Electrodes 212, 218 are formed as electrically conductive surfaces and electrically isolated from each other.
  • the evaluation unit 206 has a switching device 220, a determination device 222 and a determination device 224.
  • the switching device 220 is connected to the ground electrode 218.
  • the determination device 222 is connected to the three sensor electrodes 212a, 212b, 212c.
  • the determination device 224 is connected to the determination device 222.
  • the switching device 220 is configured to connect the ground electrode 218 to a ground potential 226 or to disconnect the ground electrode 218 from the ground potential 226.
  • the determination device 222 is designed to determine a current electrical capacitance of the first sensor surface 212a and to map it in a first capacitance value 228a.
  • the determination device 222 is designed to determine the current electrical capacitance of the second sensor surface 212b and to map it in a second capacitance value 228b. Furthermore, the determination device is designed to determine the current electrical capacitance of the third sensor electrode 212c and to map it in a third capacitance value 228c.
  • the determination device 224 is designed to determine an angle value 234 using the capacitance values 228. In this case, the electrical capacitances are once determined as reference capacitances when the ground electrode 218 is disconnected from the ground potential 226 and once again determined as working capacitances when the ground electrode 218 is connected from the ground potential 226. From the reference capacitances and working capacities mapped in the respective capacitance values 228, the determination device 224 determines the angle value 234 representing the angular position of the encoder unit 202.
  • the evaluation unit 206 has a control device 236.
  • the control device 236 is connected to the switching device 220 and the determination device 222 and to the determination device 224.
  • the control device 236 is designed to control the measurement of the angle of rotation using control signals 238.
  • the devices 220, 222, 224 are driven in a cyclic control sequence.
  • ground electrode 218 is disconnected from ground potential 226.
  • the capacitances of the sensor electrodes 212 are determined as reference capacitance values 228 and stored in the determination device.
  • the ground electrode 218 is connected to the ground potential 226.
  • the capacitances of the sensor electrodes 212 are determined as capacitance values 228.
  • a capacitance difference per sensor electrode 212 is determined.
  • the sensor electrode 212 most heavily covered by the rotary electrode 210 has the largest capacitance difference.
  • the sensor electrode 212, which is least covered by the rotary electrode has the smallest capacity difference. From a ratio of the capacitance differences can therefore be concluded that the angular position of the encoder unit 202.
  • the determination of the rotational angle position takes place via capacitive sensor surfaces 212 and an evaluation method, as can be used, for example, in touch sliders.
  • the potential difference required for the capacitive evaluation which is usually caused by the approach / touch of a human finger, is generated by the rotor electrode 202 coupled to ground 226.
  • the rotor electrode 202 is a certain geometric shape of conductive material, such as copper, which is surrounded by a non-conductive material. This rotor electrode 202 can be integrated together with a detent in the rotary selector switch and thus forms a compact assembly that can be mounted from the outside on the device panel. In a rotary movement of the rotary selector switch 200 and the rotor electrode 202 is rotated.
  • this covers different sensor surfaces 212 and thus influences their capacity.
  • the arrangement of the sensor surfaces 212 behind the device panel is exemplary in FIG FIG. 3 shown.
  • This configuration is designed, for example, for a very simple recognition of 12 detent positions / programs. For a different number of locking positions, the number of sensor surfaces 212 can be adjusted.
  • the absolute rotation angle position can be determined by the approach presented here after a device restart.
  • the average ground plane 218 is cyclically reconfigured and the sensor surfaces 212 are cyclically initialized.
  • the switching of the ground plane 218 between the two configuration states “high-impedance input” and “ground potential or ground” leads via the capacitive coupling of the rotor electrode 202 to a measurable change in capacitance of the covered sensor surface 212.
  • By simultaneously initializing the sensor surfaces 212 in the "high-impedance input "only the potential difference is measured by reconfiguring to" Ground ". All disturbing environmental conditions, such as the approach of a human hand to the rotary selector switch or temperature drifts, are filtered out.
  • FIG. 3 shows a representation of a rotation angle sensor 200 with encoder unit 202 on a control panel 104 of a household appliance.
  • the rotation angle sensor 200 substantially corresponds to the rotation angle sensor in FIG FIG. 2 ,
  • the sensor unit 204 of the rotation angle sensor 200 here in contrast to FIG. 2 six sensor electrodes 212 on.
  • the sensor electrodes 212 are formed as equal circular ring sectors.
  • the evaluation unit 206 is here a microcontroller 206.
  • the microcontroller 206 is connected to the Sensor unit 204 disposed on a common carrier 300.
  • the carrier 300 is arranged on an inner side of the control panel 104. In this case, the carrier 300 is glued in particular to the control panel in order to avoid an air gap between the sensor electrodes 212 and the control panel 104.
  • the switching device of the microcontroller 206 is connected via a control line to a switch 302 or relay 302.
  • the switch 302 connects or disconnects the ground electrode 218 from the ground potential 226 in accordance with its switching position.
  • the encoder unit 202 is integrally connected to a rotary selector switch 102 of the domestic appliance.
  • a shape of the rotary electrode 210 substantially corresponds to the shape of a sensor electrode 212 in connection with the ground electrode 218.
  • the potential generated by the encoder unit 202, which can also be labeled as the rotor electrode 202, above a sensor surface 212 makes it possible to determine the angular position of the operating element 102.
  • Capacitive evaluation methods are based on a relative change in the capacitance. In the approach presented here, a special measuring method, such as in FIG. 7 is described, applied. As a result, an absolute determination of the rotational angle position is possible without the operating element 202 having to be touched or rotated. Otherwise, a determination of the rotational angle position would be possible only after a single rotation of the operating device 202, since this leads to a relative change in capacitance at the sensor surfaces 212.
  • the measurement cycle begins with the configuration of the ground plane 218 as a high impedance input on the microcontroller 206.
  • This configuration equals an open switch 302 between the ground plane 218 and the ground potential 226.
  • the capacitances of all sensor surfaces 212 are successively measured and stored as reference values.
  • This is followed by the reconfiguration of the ground plane 218.
  • this is now configured as an output and switched to the ground potential 226.
  • This configuration equals a closed switch 302 between ground plane 218 and ground potential 226. Via the rotor electrode 202, this ground potential 226 is coupled to at least one of the sensor surfaces 212, thus increasing the capacitance of this sensor surface 212.
  • the capacitances of all sensor surfaces 212 are measured again and compared with the previously stored reference values.
  • a sensor area 212 covered by the rotor electrode 202 in this case has a significantly greater capacitance change than an uncovered sensor area 212.
  • the absolute rotational angle position of the operating element 102 can thus be determined.
  • the measurement cycle is carried out continuously and begins with the reconfiguration of the ground plane 218 as a high-impedance input and the reference value formation of the sensor capacitance again.
  • FIG. 4 shows a sectional view of a rotation angle sensor 200 with encoder unit 202 according to one embodiment.
  • the rotation angle sensor 200 essentially corresponds to the rotation angle sensor in FIG FIG. 3 ,
  • the encoder unit 202 is mounted in a holding device 400, which is connected to the outside of the control panel 104.
  • a detent 402 is attached on the holding device 400.
  • the detent 402 provides discrete angular positions for the encoder unit 202.
  • the encoder unit 202 locks in discrete angular positions in the latching station 402.
  • the sensor electrodes 212 and the ground electrode 218 are arranged here directly on the inside of the control panel 104. Here is shown how the electrodes of the sensor unit 204 and the transmitter unit 202 influence each other.
  • the rotary electrode 210 influences an electrical capacitance of one or more of the sensor electrodes 212.
  • the ground electrode 218 influences the electrical capacitance of the center electrode 208, which in turn affects the rotary electrode 210, since they are electrically conductively connected to one another.
  • the transmitter unit 202 is arranged as close as possible to the outside of the control panel 104.
  • the evaluation unit 206 is arranged here offset from the sensor unit 204 on a separate circuit board 404.
  • sensor surfaces 212 At the rear of the control panel 104 of a household appliance, such as a washing machine, there is a plurality of sensor surfaces 212 which are arranged rotationally symmetrical about a central ground surface 218.
  • the individual sensor surfaces 212 thus form sectors of a circular ring.
  • All surfaces 212, 214 are galvanically separated from each other and made of electrically conductive material.
  • the sensor surfaces 212 may, for example, be made of copper on PCB or as a guide pressure or as bonded conducting foils directly on the control panel 104.
  • An operating element 102 which is the same as the rotary selector switch 102, is arranged so as to be rotatable about the sensor surfaces 212 centered on the front side of the control panel 104.
  • the operating element 102 consists of an electrically insulating base body, which is shaped as a cylinder part.
  • the base body has an electrically conductive element 202, for example of copper, which may be referred to as a rotor electrode 202.
  • the rotor electrode 202 is on the control panel facing Side of the control element 102 and has a geometry 210 which corresponds to the ground surface 218 and a circular ring sector 212. It is thus always the ground surface 218 and depending on the angular position at least one of the sensor surfaces 212 covered.
  • All surfaces 212, 218 are electrically connected to an evaluation electronics 206, in this case a microcontroller ( ⁇ C) 206.
  • ⁇ C microcontroller
  • Conventional evaluation methods allow the capacitances of the sensor surfaces 212 to be measured against the ground potential 226.
  • the overlap of a sensor surface 212 by the rotor electrode 202 leads to a change in the capacitive near field and thus to a change in capacitance of this sensor surface 212.
  • the size of the capacitance change depends on the degree of overlap.
  • the influence of the rotor electrode 202 on the capacitance of a sensor surface 212 is based on the capacitive coupling to the ground potential 226 of the middle ground plane 218. In sensor touch applications, this ground potential can be generated by the approach of a human finger.
  • the distance between the control element 102 and the control panel 104 can be varied depending on the constructive implementation between a grinding contact and a distance of a few tenths of a millimeter.
  • the maximum possible distance at which the smallest still reliably evaluable capacitance change results depends on the diaphragm material used, the material thickness and the surface area of the sensor and ground surfaces 212, 218.
  • the relative permittivity is decisive here.
  • the control panel 104 may be made of common materials such as plastics or glass, for example. Due to the low relative permittivity of air, a minimum distance between control element 102 and control panel 104 should be aimed at for a maximum capacity change.
  • the sensor and ground surfaces 212, 218 are mounted on the back of the control panel 104 directly and without air gap.
  • the sensor surfaces 212 are identical in geometry and surface area.
  • the ground plane 218 should have the same surface area as a sensor surface 212.
  • a maximum size of the surfaces is predetermined by the available installation space in the operating element 102.
  • the six sensor surfaces 212 having an outer diameter of 40 mm have an area of each surface of 133 mm 2 .
  • FIG. 5 shows a representation of a rotation angle sensor 200 according to an embodiment.
  • the rotation angle sensor 200 substantially corresponds to the rotation angle sensor in FIG. 3 ,
  • the sensor unit 204 and the evaluation unit 206 are not arranged on the common carrier.
  • the sensor surfaces 212 and stator electrodes 212 are made of conductive material and are insulated from each other. Conceivable are versions as a foil, by glued on the back of the device panel or as a printed conductive layer on glass panels.
  • the rotor electrode is also made of conductive material, which is surrounded by non-conductive material.
  • the approach presented here has the advantage that no through-opening on the device panel is required by a contactless rotation angle determination. It can thus prevent the ingress of liquids and dirt, at the same time the production and component costs are reduced.
  • the modification of the average ground plane allows the absolute rotation angle determination even after a device restart without the rotary switch must be touched or rotated.
  • FIG. 6 shows an equivalent circuit diagram of a rotation angle sensor 200 according to an embodiment.
  • a series circuit of the evaluation unit 206, a first capacitor 600, a second capacitor 602 and the ground potential 226 is shown.
  • the first capacitance is formed by a single sensor electrode 212 and the rotary electrode 210.
  • the second capacitance 602 is formed by the center electrode 208 and the ground electrode 218.
  • the ground potential 226 is switched to the ground electrode 218 by the switching device.
  • a first parasitic capacitance 604 acts between the evaluation unit 206 and the first capacitor 600.
  • a second parasitic capacitance 606 acts on the transmitter unit 202.
  • the parasitic capacitances 604, 606 represent, for example, environmental influences.
  • the parasitic capacitances 604, 606 are connected on one side to the ground electrode 218.
  • the equivalent circuit diagram in FIG. 6 illustrates that from the perspective of the evaluation 206 a series connection of the relevant capacitances C S and C M 600, 602 results against the ground potential 226.
  • C s 600 is the capacitance between sensor surface 212 and rotor electrode 202
  • C M 602 is the capacitance between rotor electrode 202 and ground plane 218.
  • C par1 and C par2 604, 606 are interfering parasitic capacitances.
  • FIG. 7 shows a flowchart of a method 700 for measuring an angular position according to an exemplary embodiment.
  • a problem in the application of capacitive evaluation in combination with a rotor electrode is the determination of the absolute rotational angle position after switching on a device and without touching the Rotary dial.
  • Known evaluation methods are based on a relative change in capacity. When the device is switched on, the sensor surfaces are initialized and their capacitance measured. If there is no change in the angle of rotation or contact with the rotary selector switch, no change in capacitance at the sensor surfaces can be measured. Thus, it is not possible to determine the rotational angle position.
  • the approach presented here describes a method 700 that solves this problem. The method 700 may be performed on an angle sensor as shown in the previous figures.
  • the method 700 includes a step 702 of disconnecting, a step 704 of determining, a step 706 of connecting, a further step 708 of determining, and a step 710 of determining.
  • a ground electrode of the angle sensor is disconnected from a ground potential.
  • current electrical capacitances of sensor electrodes of the angle sensor are mapped into reference capacitance values.
  • the ground electrode is connected to the ground potential.
  • the current capacities of the sensor electrodes are mapped into capacitance values.
  • an angle value representing the angular position is determined using the reference capacitance values and the capacitance values.
  • a contactless rotation angle determination is presented by the control panel of a household appliance.
  • the absolute rotational angle position can also be determined without touching the rotary selector switch results in another conceivable application for this method 700.
  • the descriptive capacitive angle of rotation determination could also be determined in Connection with a through hole as a low-wear replacement for the existing evaluation can be used directly on the control and display electronics.
  • the sensor surfaces can be cost-effectively etched directly as a conductive structure.
  • the rotor electrode can be mounted over a suitable guide with an air gap of a few tenths of a millimeter above the sensor surfaces. If a rotation on the rotary selector switch, this rotation angle change is transmitted via the shaft and the through hole to the mounted rotor electrode. As already described, the overlapping of the sensor surfaces changes, which makes it possible to determine the absolute angle of rotation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Claims (9)

  1. Procédé (700) pour la mesure d'une position angulaire d'une unité de transmission rotative (202) en utilisant une unité de détection (204) isolée électriquement de l'unité de transmission (202), dans lequel l'unité de transmission (202) présente une électrode centrale (208) disposée dans un plan de transmission et une électrode rotative (210) disposée dans le plan de transmission, reliée à l'électrode centrale (208) de manière conductrice et décalée latéralement par rapport à celle-ci, dans lequel l'unité de détection (204) présente une première électrode de détection (212a) disposée dans un plan de détection et au moins une deuxième électrode de détection (212b) disposée dans le plan de détection, dans lequel les électrodes de détection (212) sont disposées de manière circulaire autour d'une électrode de terre (218) disposée dans le plan de détection, dans lequel le plan de transmission et le plan de détection sont orientés sensiblement parallèlement entre eux, l'unité de transmission (202) est montée de manière rotative autour de l'électrode centrale (208), l'électrode rotative (210) est mobile dans la zone des électrodes de détection (212) sur une piste circulaire, et l'électrode centrale (208) est orientée vers l'électrode de terre (218), et dans lequel l'électrode de terre (218) est configurée pour influencer une capacité de l'électrode centrale (208), et dans lequel l'électrode rotative (210) est configurée pour influencer, en fonction de la position angulaire de l'unité de transmission (202), une capacité d'au moins une des électrodes de détection (212), et dans lequel le procédé (700) comprend les étapes suivantes :
    séparation (702) de l'électrode de terre (218) et d'un potentiel de terre (226) au moyen d'un commutateur (302) ;
    détermination (704) d'une première valeur de capacité de référence (228a) représentant une capacité effective de la première électrode de détection (212a) et d'au moins une deuxième valeur de capacité de référence (228b) représentant une capacité effective de la deuxième électrode de détection (212b) ;
    liaison (706) de l'électrode de terre (218) et du potentiel de terre (226) au moyen du commutateur (302) ;
    détermination (708) d'une première valeur de capacité (228a) représentant une capacité effective de la première électrode de détection (212a) et d'au moins une deuxième valeur de capacité (228b) représentant une capacité effective de la deuxième électrode de détection (212b) ;
    calcul (710) d'une valeur angulaire (234) représentant la position angulaire de l'unité de transmission (202) en utilisant les valeurs de capacité de référence (228) et les valeurs de capacité (228).
  2. Procédé selon la revendication 1, dans lequel les étapes du procédé (700) sont répétées de manière cyclique.
  3. Détecteur d'angle de rotation (200) pour la mesure d'une position angulaire d'une unité de transmission rotative, dans lequel le capteur d'angle de rotation (200) présente les caractéristiques suivantes :
    une unité de transmission (202) qui présente une électrode centrale (208) disposée dans un plan de transmission et une électrode rotative (210) disposée dans le plan de transmission, reliée à l'électrode centrale (208) de manière conductrice et décalée latéralement par rapport à celle-ci ;
    une unité de détection (204) qui présente une première électrode de détection (212a) disposée dans un plan de détection et au moins une deuxième électrode de détection (212b) disposée dans le plan de détection, dans lequel les électrodes de détection (212) sont disposées de manière circulaire autour d'une électrode de terre (218) disposée dans le plan de détection, dans lequel un centre de l'électrode de terre (218) prédéfinit un centre de l'électrode centrale (208) ; et
    une unité d'évaluation (206) qui est reliée aux électrodes de détection (212) et à l'électrode de terre (218) ainsi qu'à un commutateur (302) via une ligne de commande, et qui est configurée pour
    la séparation (702) de l'électrode de terre (218) et d'un potentiel de terre (226) au moyen du commutateur (302) ; la détermination (704) d'une première valeur de capacité de référence (228a) représentant une capacité effective de la première électrode de détection (212a) et d'au moins une deuxième valeur de capacité de référence (228b) représentant une capacité effective de la deuxième électrode de détection (212b) ;
    la liaison (706) de l'électrode de terre (218) et du potentiel de terre (226) au moyen du commutateur (302) ;
    la détermination (708) d'une première valeur de capacité (228a) représentant une capacité effective de la première électrode de détection (212a) et d'au moins une deuxième valeur de capacité (228b) représentant une capacité effective de la deuxième électrode de détection (212b) ; et
    le calcul (710) d'une valeur angulaire (234) représentant la position angulaire de l'unité de transmission (202) en utilisant les valeurs de capacité de référence (228) et les valeurs de capacité (228).
  4. Détecteur d'angle de rotation (200) selon la revendication 3, dans lequel les électrodes de détection (212) ont la forme d'un segment de cercle.
  5. Détecteur d'angle de rotation (200) selon la revendication 3 ou 4, dans lequel l'électrode de terre (218) est formée de manière circulaire.
  6. Détecteur d'angle de rotation (200) selon la revendication 3, 4 ou 5, avec au moins une autre électrode de détection (212) disposée dans le plan de détection.
  7. Appareil domestique (100) avec un détecteur d'angle de rotation (200) selon l'une des revendications 3 à 6, dans lequel le plan de détection du dispositif de détection (204) est disposé sur une face intérieure d'un panneau de commande (104) de l'appareil domestique (100) et le plan de transmission est disposé sur la face externe du panneau de commande (104), dans lequel le dispositif de transmission (202) est couplé de manière solidaire à un élément de commande (102) de l'appareil domestique (100) et monté de manière rotative sur la face externe, dans lequel un axe de rotation de l'élément de commande (102) coïncide sensiblement avec les centres de l'électrode centrale (208) et de l'électrode de terre (210) et le dispositif d'évaluation (206) est relié aux électrodes de détection (212) et à l'électrode de terre (218).
  8. Appareil domestique (100) selon la revendication 7, dans lequel l'élément de commande est un commutateur rotatif (102) et se compose d'un corps de base électriquement isolant qui est formé en tant que pièce cylindrique, et dans lequel le dispositif de transmission (202) est installé sur la face de l'élément de commande (102) tournée vers le panneau de commande.
  9. Produit de programme informatique avec un code de programme pour l'exécution du procédé (700) selon l'une des revendications 1 ou 2, lorsque le produit de programme informatique est exécuté sur un dispositif.
EP16190120.2A 2015-10-23 2016-09-22 Procédé et capteur de rotation destiné à mesurer une position angulaire d'un capteur rotatif Active EP3159660B1 (fr)

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DE102015118083.9A DE102015118083A1 (de) 2015-10-23 2015-10-23 Verfahren und Drehwinkelsensor zum Messen einer Winkelstellung einer drehbaren Gebereinheit

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US10330467B2 (en) 2016-06-01 2019-06-25 Virtek Vision International Ulc Precision locating rotary stage
DE102016110085A1 (de) * 2016-06-01 2017-12-07 Miele & Cie. Kg Vorrichtung und Verfahren zum Erfassen einer Drehposition eines drehbaren Elements, Steuergerät, Sensorsystem zum Ermitteln einer Drehposition eines drehbaren Elements und Haushaltgerät
JP7202776B2 (ja) * 2017-11-09 2023-01-12 株式会社シマノ 回転検出装置およびこれを備える制動装置
DE102018120576B3 (de) 2018-08-23 2020-01-30 Preh Gmbh Eingabevorrichtung mit beweglicher Handhabe auf kapazitiver Detektionsfläche und redundanter kapazitiver Potenzialeinkopplung
US20210088361A1 (en) * 2019-09-20 2021-03-25 Diehl Ako Stiftung & Co. Kg Sensor device, operating device and household appliance having the operating device
WO2022083846A1 (fr) * 2020-10-19 2022-04-28 Fraba B.V. Système capacitif de mesure d'angles de rotation et procédé d'adaptation d'un système capacitif de mesure d'angles de rotation
FR3141782A1 (fr) * 2022-11-09 2024-05-10 Dav Interface pour commande d’une fonction d’un véhicule automobile

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DE102015118083A1 (de) 2017-04-27
US10113885B2 (en) 2018-10-30
US20170115136A1 (en) 2017-04-27

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